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165 lines
4.4 KiB
Diff
165 lines
4.4 KiB
Diff
From 58d058f1fe1cc5981c57be8b48d3b2f74f25c0d6 Mon Sep 17 00:00:00 2001
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From: Jan Kiszka <jan.kiszka@siemens.com>
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Date: Sun, 11 Sep 2016 23:30:04 +0200
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Subject: [PATCH] jailhouse: Add simple debug console via the hypervisor
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Jailhouse allows explicitly enabled cells to write character-wise
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messages to the hypervisor debug console. Make use of this for a
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platform-agnostic boot diagnosis channel, specifically for non-root
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cells. This also comes with earlycon support.
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Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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(cherry picked from commit 60685bd589aef4972d20724863079edf2039eaa2)
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From http://git.kiszka.org/?p=linux.git;a=shortlog;h=refs/heads/queues/jailhouse
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---
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MAINTAINERS | 1 +
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drivers/virt/Kconfig | 11 +++++
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drivers/virt/Makefile | 1 +
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drivers/virt/jailhouse_dbgcon.c | 103 ++++++++++++++++++++++++++++++++++++++++
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4 files changed, 116 insertions(+)
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create mode 100644 drivers/virt/jailhouse_dbgcon.c
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--- a/MAINTAINERS
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+++ b/MAINTAINERS
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@@ -8772,6 +8772,7 @@ L: jailhouse-dev@googlegroups.com
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S: Maintained
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F: arch/x86/kernel/jailhouse.c
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F: arch/x86/include/asm/jailhouse_para.h
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+F: drivers/virt/jailhouse_dbgcon.c
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JC42.4 TEMPERATURE SENSOR DRIVER
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M: Guenter Roeck <linux@roeck-us.net>
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--- a/drivers/virt/Kconfig
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+++ b/drivers/virt/Kconfig
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@@ -31,5 +31,16 @@ config FSL_HV_MANAGER
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4) A kernel interface for receiving callbacks when a managed
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partition shuts down.
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+config JAILHOUSE_DBGCON
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+ tristate "Jailhouse console driver"
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+ depends on X86 || ARM || ARM64
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+ help
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+ The Jailhouse hypervisor provides a simple write-only console for
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+ debugging the bootstrap process of its cells. This driver registers
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+ a console with the kernel to make use of it.
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+
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+ Note that Jailhouse has to be configured to permit a cell the usage
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+ of the console interface.
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+
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source "drivers/virt/vboxguest/Kconfig"
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endif
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--- a/drivers/virt/Makefile
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+++ b/drivers/virt/Makefile
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@@ -4,4 +4,5 @@
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#
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obj-$(CONFIG_FSL_HV_MANAGER) += fsl_hypervisor.o
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+obj-$(CONFIG_JAILHOUSE_DBGCON) += jailhouse_dbgcon.o
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obj-y += vboxguest/
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--- /dev/null
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+++ b/drivers/virt/jailhouse_dbgcon.c
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@@ -0,0 +1,103 @@
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+/* SPDX-License-Identifier: GPL-2.0 */
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+/*
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+ * Console driver for running over the Jailhouse partitioning hypervisor
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+ *
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+ * Copyright (c) Siemens AG, 2016-2018
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+ *
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+ * Authors:
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+ * Jan Kiszka <jan.kiszka@siemens.com>
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+ */
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+
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+#include <linux/console.h>
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+#include <linux/hypervisor.h>
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+#include <linux/module.h>
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+#include <linux/serial_core.h>
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+#ifdef CONFIG_X86
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+#include <asm/alternative.h>
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+#endif
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+#ifdef CONFIG_ARM
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+#include <asm/opcodes-virt.h>
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+#endif
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+
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+#define JAILHOUSE_HC_DEBUG_CONSOLE_PUTC 8
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+
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+static void hypervisor_putc(char c)
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+{
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+#if defined(CONFIG_X86)
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+ int result;
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+
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+ asm volatile(
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+ ALTERNATIVE(".byte 0x0f,0x01,0xc1", ".byte 0x0f,0x01,0xd9",
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+ X86_FEATURE_VMMCALL)
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+ : "=a" (result)
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+ : "a" (JAILHOUSE_HC_DEBUG_CONSOLE_PUTC), "D" (c)
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+ : "memory");
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+#elif defined(CONFIG_ARM)
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+ register u32 num_res asm("r0") = JAILHOUSE_HC_DEBUG_CONSOLE_PUTC;
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+ register u32 arg1 asm("r1") = c;
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+
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+ asm volatile(
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+ __HVC(0x4a48)
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+ : "=r" (num_res)
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+ : "r" (num_res), "r" (arg1)
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+ : "memory");
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+#elif defined(CONFIG_ARM64)
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+ register u64 num_res asm("x0") = JAILHOUSE_HC_DEBUG_CONSOLE_PUTC;
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+ register u64 arg1 asm("x1") = c;
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+
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+ asm volatile(
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+ "hvc #0x4a48\n\t"
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+ : "=r" (num_res)
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+ : "r" (num_res), "r" (arg1)
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+ : "memory");
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+#else
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+#error Unsupported architecture.
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+#endif
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+}
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+
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+static void jailhouse_dbgcon_write(struct console *con, const char *s,
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+ unsigned count)
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+{
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+ while (count > 0) {
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+ hypervisor_putc(*s);
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+ count--;
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+ s++;
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+ }
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+}
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+
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+static int __init early_jailhouse_dbgcon_setup(struct earlycon_device *device,
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+ const char *options)
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+{
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+ device->con->write = jailhouse_dbgcon_write;
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+ return 0;
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+}
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+
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+EARLYCON_DECLARE(jailhouse, early_jailhouse_dbgcon_setup);
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+
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+static struct console jailhouse_dbgcon = {
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+ .name = "jailhouse",
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+ .write = jailhouse_dbgcon_write,
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+ .flags = CON_PRINTBUFFER | CON_ANYTIME,
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+ .index = -1,
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+};
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+
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+static int __init jailhouse_dbgcon_init(void)
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+{
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+ if (!jailhouse_paravirt())
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+ return -ENODEV;
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+
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+ register_console(&jailhouse_dbgcon);
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+ return 0;
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+}
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+
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+static void __exit jailhouse_dbgcon_exit(void)
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+{
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+ unregister_console(&jailhouse_dbgcon);
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+}
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+
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+module_init(jailhouse_dbgcon_init);
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+module_exit(jailhouse_dbgcon_exit);
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+
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+MODULE_LICENSE("GPL v2");
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+MODULE_DESCRIPTION("Jailhouse debug console driver");
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+MODULE_AUTHOR("Jan Kiszka <jan.kiszka@siemens.com>");
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